http://unix.derkeiler.com/Mailing-Lists/FreeBSD/questions/2007-06/msg02018.html
大概是最早出处了。。。

Basically when running ./autogen or bootstrap, you get something like:
fed# automake
src/Makefile.am:3: Libtool library used but `LIBTOOL' is undefined
src/Makefile.am:3:
src/Makefile.am:3: The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL'
src/Makefile.am:3: to `configure.in' and run `aclocal' and `autoconf' again.

This is caused because FreeBSD renames the default tools, like aclocal to
aclocal19. When aclocal is run, it looks for files in its FreeBSD set directory,
/usr/local/share/aclocal19 but most normal apps, like libtool, install to
/usr/local/share/aclocal. The solution? Simple! Just merge the contents into one
directory, delete the other, and create a symlink!

【 在 acalism (Lenny·既无意义，何必原谅？) 的大作中提到: 】
: 网络上的一个解决方法：
: 版权：网络转载请保留作者(foxcamel) 及 原文链接:http://www.ispig.net/index.php/archives/171
: 最近在重新编译php的时候，看到pecl官方网站已经挂出了sphinx的pecl扩展，于是就想尝试一下，在安装sphinx库的时候，需要先 build一个configure文件。自从安装fedora9之后，我还从来没有build过任何东西，所以没有料到会出问题。在执行 buildconf.sh的时候，遇到了这样
: ...................
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FROM 210.77.2.*